If not a complete exhale, the Broncos may have at least stopped holding their collective breath. The early indication is starting running Knowshon Moreno suffered a severe right hamstring injury, according to an NFL source.

The fear is that Knowshon Moreno may have suffered a partially torn hamstring. The degree of the tear is the key.

Although hamstring injuries can vary in severity — and Moreno no doubt popped his pretty good — strained, or torn, muscles typically heal quicker than ripped up knee ligaments. Remember, there are still 42 days remaining until the Broncos’ first game, sept. 12 at Jacksonville.

Moreno suffered his right leg injury after catching a screen pass and fell in pain after making a cut. He had to be carted off the field and assisted into the locker room.

A few minutes later, backup running back Correll Buckhalter also walked off the field, under his own power, with what has been diagnosed with an upper-back pull, according to an NFL source.